/*
 * Author:
 *	Guido Draheim <guidod@gmx.de>
 *
 *	Copyright (c) 2000,2001,2002,2003 Guido Draheim
 *      All rights reserved
 *	    use under the restrictions of the
 *	    Lesser GNU General Public License
 *          or alternatively the restrictions
 *          of the Mozilla Public License 1.1
 *
 *  The information was taken from appnote-981119-iz.zip
 *  at http://www.freesoftware.com/pub/infozip/doc/
 *  which in turn is based on PKWARE's appnote.txt
 *  (newer link: ftp://ftp.info-zip.org/pub/infozip/doc/)
 */
#ifndef _ZZIP_FORMAT_H /* zzipformat.h */
#define _ZZIP_FORMAT_H

#include <zzip_types.h>
/* we have ICO C 9X types defined */

/*
 * Overall zipfile format
 *  [local file header + file data stream + checksum descriptor] ...
 *   ...  [disk central directory] [disk trailer record]
 */

#ifdef _MSC_VER
    #pragma pack(push, 1)
#endif

struct zzip_version
{
    zzip_byte_t version[1];
    zzip_byte_t ostype[1];
} __zzip_attribute__((packed));

struct zzip_dostime
{
    zzip_byte_t time[2];
    zzip_byte_t date[2];
} __zzip_attribute__((packed));

#ifdef ZZIP_NEED_PACKED
/* if your compiler does interesting things about struct packing... */
typedef zzip_byte_t zzip_version_t[2];
typedef zzip_byte_t zzip_dostime_t[4];
#else
typedef struct zzip_version zzip_version_t;
typedef struct zzip_dostime zzip_dostime_t;
#endif

#define ZZIP_CHECKMAGIC(__p, __A, __B, __C, __D) \
    ((((zzip_byte_t*)(__p))[0] == (__A)) && \
     (((zzip_byte_t*)(__p))[1] == (__B)) && \
     (((zzip_byte_t*)(__p))[2] == (__C)) && \
     (((zzip_byte_t*)(__p))[3] == (__D)))

/* A. Local file header */
struct zzip_file_header
{
#define ZZIP_FILE_HEADER_MAGIC 0x04034b50
#define ZZIP_FILE_HEADER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p, 'P', 'K', '\3', '\4')
    zzip_byte_t z_magic[4];   /* local file header signature (0x04034b50) */
    zzip_version_t z_extract; /* version needed to extract */
    zzip_byte_t z_flags[2];   /* general purpose bit flag */
    zzip_byte_t z_compr[2];   /* compression method */
    zzip_dostime_t z_dostime; /* last mod file time (dos format) */
    zzip_byte_t z_crc32[4];   /* crc-32 */
    zzip_byte_t z_csize[4];   /* compressed size */
    zzip_byte_t z_usize[4];   /* uncompressed size */
    zzip_byte_t z_namlen[2];   /* filename length (null if stdin) */
    zzip_byte_t z_extras[2];   /* extra field length */
    /* followed by filename (of variable size) */
    /* followed by extra field (of variable size) */
} __zzip_attribute__((packed));
#define zzip_file_header_headerlength (4 + 2 + 2 + 2 + 4 + 4 + 4 + 4 + 2 + 2)

/* B. data descriptor
 * the data descriptor exists only if bit 3 of z_flags is set. It is byte aligned
 * and immediately follows the last byte of compressed data. It is only used if
 * the output media of the compressor was not seekable, eg. standard output.
 */
struct zzip_file_trailer
{
#define ZZIP_FILE_TRAILER_MAGIC 0x08074B50
#define ZZIP_FILE_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p, 'P', 'K', '\7', '\8')
    zzip_byte_t z_magic[4];   /* data descriptor signature (0x08074b50) */
    zzip_byte_t z_crc32[4];   /* crc-32 */
    zzip_byte_t z_csize[4];   /* compressed size */
    zzip_byte_t z_usize[4];   /* uncompressed size */
} __zzip_attribute__((packed));
#define zzip_file_trailer_headerlength (4 + 4 + 4 + 4)

/* C. central directory structure:
    [file header] . . . end of central dir record
 */

/* directory file header
 * - a single entry including filename, extras and comment may not exceed 64k.
 */

struct zzip_disk_entry
{
#define ZZIP_DISK_ENTRY_MAGIC 0x02014b50
#define ZZIP_DISK_ENTRY_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p, 'P', 'K', '\1', '\2')
    zzip_byte_t z_magic[4];   /* central file header signature (0x02014b50) */
    zzip_version_t z_encoder;  /* version made by */
    zzip_version_t z_extract;  /* version need to extract */
    zzip_byte_t z_flags[2];   /* general purpose bit flag */
    zzip_byte_t z_compr[2];   /* compression method */
    zzip_dostime_t z_dostime;  /* last mod file time&date (dos format) */
    zzip_byte_t z_crc32[4];   /* crc-32 */
    zzip_byte_t z_csize[4];   /* compressed size */
    zzip_byte_t z_usize[4];   /* uncompressed size */
    zzip_byte_t z_namlen[2];  /* filename length (null if stdin) */
    zzip_byte_t z_extras[2];   /* extra field length */
    zzip_byte_t z_comment[2];  /* file comment length */
    zzip_byte_t z_diskstart[2];  /* disk number of start (if spanning zip over multiple disks) */
    zzip_byte_t z_filetype[2];   /* internal file attributes, bit0 = ascii */
    zzip_byte_t z_filemode[4];   /* extrnal file attributes, eg. msdos attrib byte */
    zzip_byte_t z_offset[4];     /* relative offset of local file header, seekval if singledisk */
    /* followed by filename (of variable size) */
    /* followed by extra field (of variable size) */
    /* followed by file comment (of variable size) */
} __zzip_attribute__((packed));
#define zzip_disk_entry_headerlength (4 + 2 + 2 + 2 + 2 + 4 + 4 + 4 + 4 + 2 + 2 + 2 + 2 + 2 + 4 + 4)


struct zzip_root_dirent
{   /* the old name of the structure above */
#define ZZIP_ROOT_DIRENT_MAGIC 0x02014b50
#define ZZIP_ROOT_DIRENT_CHECKMAGIC(__p) ZZIP_DISK_ENTRY_CHECKMAGIC(__p)
    zzip_byte_t z_magic[4];
    zzip_version_t z_encoder;
    zzip_version_t z_extract;
    zzip_byte_t z_flags[2];
    zzip_byte_t z_compr[2];
    zzip_dostime_t z_dostime;
    zzip_byte_t z_crc32[4];
    zzip_byte_t z_csize[4];
    zzip_byte_t z_usize[4];
    zzip_byte_t z_namlen[2];
    zzip_byte_t z_extras[2];
    zzip_byte_t z_comment[2];
    zzip_byte_t z_diskstart[2];
    zzip_byte_t z_filetype[2];
    zzip_byte_t z_filemode[4];
    zzip_byte_t z_off[4];
} __zzip_attribute__((packed));


/* end of central dir record */
struct zzip_disk_trailer
{
#define ZZIP_DISK_TRAILER_MAGIC 0x06054b50
#define ZZIP_DISK_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p, 'P', 'K', '\5', '\6')
    zzip_byte_t z_magic[4];  /* end of central dir signature (0x06054b50) */
    zzip_byte_t z_disk[2];   /* number of this disk */
    zzip_byte_t z_finaldisk[2];  /* number of the disk with the start of the central dir */
    zzip_byte_t z_entries[2];  /* total number of entries in the central dir on this disk */
    zzip_byte_t z_finalentries[2];  /* total number of entries in the central dir */
    zzip_byte_t z_rootsize[4];  /* size of the central directory */
    zzip_byte_t z_rootseek[4];  /* offset of start of central directory with respect to *
                                 * the starting disk number */
    zzip_byte_t z_comment[2];   /* zipfile comment length */
    /* followed by zipfile comment (of variable size) */
} __zzip_attribute__((packed));
#define zzip_disk_trailer_headerlength (4 + 2 + 2 + 2 + 2 + 4 + 4 + 2)

/* extra field should be type + size + data + type + size + data ... */
struct zzip_extra_block
{                              /* fetch.h macros do not need this struct */
    zzip_byte_t z_datatype[2];        /* as input type - a mere <char*> is okay */
    zzip_byte_t z_datasize[2];        /* being returned by xx_to_extras usually */
} __zzip_attribute__((packed));
#define zzip_extra_block_headerlength (2 + 2)

/* Zip64 end of central dir record */
struct zzip_disk64_trailer
{
#define ZZIP_DISK64_TRAILER_MAGIC 0x06064b50
#define ZZIP_DISK64_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p, 'P', 'K', '\6', '\6')
    zzip_byte_t z_magic[4];  /* end of central dir signature (0x06054b50) */
    zzip_byte_t z_size[8];   /* size of this central directory record */
    zzip_version_t z_encoder;  /* version made by */
    zzip_version_t z_extract;  /* version need to extract */
    zzip_byte_t z_disk[4];   /* number of this disk */
    zzip_byte_t z_finaldisk[4];  /* number of the disk with the start of the central dir */
    zzip_byte_t z_entries[8];  /* total number of entries in the central dir on this disk */
    zzip_byte_t z_finalentries[8];  /* total number of entries in the central dir */
    zzip_byte_t z_rootsize[8];  /* size of the central directory */
    zzip_byte_t z_rootseek[8];  /* offset of start of central directory with respect to *
                                 * the starting disk number */
    /* followed by zip64 extensible data sector (of variable size) */
} __zzip_attribute__((packed));
#define zzip_disk64_trailer_headerlength (4 + 8 + 2 + 2 + 4 + 4 + 8 + 8 + 8 + 8)

/* z_flags */
#define ZZIP_IS_ENCRYPTED(p)    ((*(zzip_byte_t*)p) & 1)
#define ZZIP_IS_COMPRLEVEL(p)  (((*(zzip_byte_t*)p) >> 1) & 3)
#define ZZIP_IS_STREAMED(p)    (((*(zzip_byte_t*)p) >> 3) & 1)
#define ZZIP_IS_PATCHED(p)     (((*(zzip_byte_t*)p) >> 5) & 1)

/* z_compr */
#define ZZIP_IS_STORED 0
#define ZZIP_IS_SHRUNK 1
#define ZZIP_IS_REDUCEDx1 2
#define ZZIP_IS_REDUCEDx2 3
#define ZZIP_IS_REDUCEDx3 4
#define ZZIP_IS_REDUCEDx4 5
#define ZZIP_IS_IMPLODED 6
#define ZZIP_IS_TOKENIZED 7
#define ZZIP_IS_DEFLATED 8
#define ZZIP_IS_DEFLATED_BETTER 9
#define ZZIP_IS_IMPLODED_BETTER 10

/* deflated comprlevel */
#define ZZIP_DEFLATED_STD_COMPR 0
#define ZZIP_DEFLATED_MAX_COMPR 1
#define ZZIP_DEFLATED_LOW_COMPR 2
#define ZZIP_DEFLATED_MIN_COMPR 3

#ifdef _MSC_VER
    #pragma pack(pop)
#endif

#endif /* _ZZIPFORMAT_H */